Mary had two lessons on Friday afternoon.
题目
Mary had two lessons on Friday afternoon.
针对two提问,这是改变句型.
答案
How many lessons did Mary have on Friday afternoon?
two是数量词,用how much 或how many 而lesson是可数名词,故用How many提问
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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